轻质原油采出液低温破乳剂优选及作用机理

doi:10.3969/j.issn.2097-2806.2023.07.006

Abstract

Abstract:

The produced fluid with light crude oil from low-permeability oil field has a big problem in demulsification. Conventional demulsifiers have poor demulsification effect at low temperature （<60 ℃）. In this work, the simulated emulsion was prepared according to the produced fluid of an oil field. The demulsification effect of different types of demulsifiers and the microdynamic characteristics of the emulsion were studied by bottle test and stability analyzer, and the best formula of low-temperature demulsifier was selected; the viscoelasticity and interfacial tension of oil-water interface, and the dynamic adsorption law of the demulsifier at oil-water interface were studied by using an interfacial rheometer, and the action mechanism of low-temperature demulsifier was revealed. Finally, the demulsification effects of different types of demulsifiers at low temperature were analyzed from the perspectives of emulsion dehydration rate, adhesion degree and demulsifier mass concentration. It might provide a theoretical and field-application basis for the research and development of low-temperature demulsification technology for the produced fluid from low-permeability oilfield.

Key words: light crude oil, produced fluid, low-temperature demulsifier, demulsification mechanism

CLC Number:

TE348

Tian Shujie, Gao Wei. Optimization and mechanisms of low-temperature demulsifier for produced fluid with light crude oil[J].China Surfactant Detergent & Cosmetics, 2023, 53(7): 773-780.

Figures/Tables 12

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References 17

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油样	w （饱和分） / %	w （芳香分） / %	w （胶质） / %	w （沥青质） / %
1	74.14	16.50	4.19	5.17
2	75.05	16.55	3.86	4.54

等级	挂壁		水相		界面		ρ（破乳剂）/（mg/L）
等级	程度	赋分	清洁度	赋分	整齐度	赋分	数值	赋分
1	无	1	清	1	齐	1	100	1
2	少量	0.5	稍清	0.5	稍齐	0.5	150	0.5
3	中等	0	稍浊	0	稍不齐	0	200	0

实验号	破乳剂	ρ （破乳剂） / （mg/L）	脱水率赋分	挂壁赋分	水相赋分	界面赋分
1	PR929	100	6.96	1	1	1
2	PR929	150	8.51	0.5	1	1
3	PR929	200	5.80	0.5	1	1
4	PRC06	100	6.98	0.5	0.5	1
5	PRC06	150	7.79	0.5	1	1
6	PRC06	200	9.25	0	1	1
7	AR902	100	7.94	0.5	1	1
8	AR902	150	8.45	0.5	1	1
9	AR902	200	7.02	0.5	1	1

Optimization and mechanisms of low-temperature demulsifier for produced fluid with light crude oil

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